diff options
| author | Brian Gerst <brgerst@gmail.com> | 2009-02-10 09:51:46 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-11 12:40:45 +0100 |
| commit | 253f29a4ae9cc6cdc7b94f96517f27a93885a6ce (patch) | |
| tree | 09942e565938a6bac216b1725ccf607e01d09b20 /arch/x86/kernel/entry_32.S | |
| parent | aa78bcfa01dec3cdbde3cda098ce32abbd9c3bf6 (diff) | |
x86: pass in pt_regs pointer for syscalls that need it
Some syscalls need to access the pt_regs structure, either to copy
user register state or to modifiy it. This patch adds stubs to load
the address of the pt_regs struct into the %eax register, and changes
the syscalls to regparm(1) to receive the pt_regs pointer as the
first argument.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/entry_32.S')
| -rw-r--r-- | arch/x86/kernel/entry_32.S | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 5f5bd22adcd4..3de7b5710dc8 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -697,6 +697,26 @@ syscall_badsys: END(syscall_badsys) CFI_ENDPROC +/* + * System calls that need a pt_regs pointer. + */ +#define PTREGSCALL(name) \ + ALIGN; \ +ptregs_##name: \ + leal 4(%esp),%eax; \ + jmp sys_##name; + +PTREGSCALL(iopl) +PTREGSCALL(fork) +PTREGSCALL(clone) +PTREGSCALL(vfork) +PTREGSCALL(execve) +PTREGSCALL(sigaltstack) +PTREGSCALL(sigreturn) +PTREGSCALL(rt_sigreturn) +PTREGSCALL(vm86) +PTREGSCALL(vm86old) + .macro FIXUP_ESPFIX_STACK /* since we are on a wrong stack, we cant make it a C code :( */ PER_CPU(gdt_page, %ebx) |